1.Hefinishedhishomework,thenhewenton_______aletter.
a.writeb.writingc.withwritingd.towrite
为什么不选b?
2.___wheretogo,heaskedapolicemantheway.
a.Havinglosthiswayandnotknowing
b.Losinghiswayanddidn'tknow
c.Losthiswayandnotknowing
d.losthiswayanddidn'tknow
答案好像是d,为什么不选a?